pt. 1. Introduction and protozoa: fasc. 1 / by S.J. Hickson [and others] -- pt. 1. Introduction and protozoa: fasc. 2 / by J.B. Farmer [and others] -- pt. 2. The Porifera and Coelentera / by E.A. Minchin, G. Herbert Fowler, and Gilbert C. Bourne -- pt. 3. The Echinoderma / by F.A. Bather -- pt. 4. The Platyhelmia, Mesozoa, and Nemertini / by W. Blaxland Benham -- pt. 5. Mollusca / by Paul Pelseneer -- pt. 7. Appendiculata, 3rd fasc.: Crustacea / by W.T. Calman -- pt. 9. Vertebrata Craniata, 1st fasc.: Cyclostomes and fishes / by E.S. Goodrich